Method and system for bandwidth-compressed transmission of a video signal in the NTSC system

Claim 4

A system as recited in claim 1 further comprising: means connected between said predictive coding means and said transmitting means for multiplexing said predictively coded sum and difference signals for transmission.

Claim 5

A system as recited in claim 1 wherein said orthonormal transforming means comprises a Hadamard Transformer.

Claim 6

A system as recited in claim 1 wherein: said predictive coding means comprises a Delta PCM coder.

Claim 7

A system as recited in claim 1 wherein a mode switch is provided for selecting said produced sum and difference signals and supplying said selected signals to said predictive coding means, and further wherein said sum and difference signal producing means comprises: means for storing the transformed digital signals from said orthonormal transforming means corresponding to one horizontal line period of the composite video signal, for each such horizontal line period in succession, means for producing the sum of the transformed digital signals from said orthonormal transforming means corresponding to a given horizontal line period of the composite signal with the transformed digital signals stored in said storing means and corresponding to the respectively next preceding horizontal line period of the composite video signal, for each horizontal line period of the composite video signal, in succession, means for producing the difference of the transformed digital signals from said orthonormal transforming means corresponding to the given horizontal line period of the composite video signal and the transformed digital signals stored in said storing means and corresponding to the respectively next preceding horizontal line period of the composite vide signal, for each horizontal line period of the composite video signal, in succession, means for inverting the difference signal output of said difference signal providing means, means for supplying the difference output signal from said difference signal producing means and the inverted difference signal output of said inverter alternately in successive line periods to said mode switch, thereby to supply the difference video signal to said mode switch in a common polarity, and said mode switch further is connected to said sum signal producing means to receive the sum signal output thereof, thereby to alternately supply the sum signal and the difference signal to said predictive coding means.

Claim 8

A system as recited in claim 6 wherein said storing means comprises a shift register.

Claim 9

A system as recited in claim 1, further comprising: first storing means connected to said input means for receiving in serial form the converted digital signal output of said converting means corresponding to one horizontal line period of the composite video signal and for storing the said digital signals and providing said stored digital signals to said orthonormal transforming means in parallel, said orthonormal transforming means transforming the parallel digital signals received from said first storing means and producing transformed parallel output digital signals, second storing means for receiving said parallel, transformed output signals from said orthonormal transforming means and storing the said signals and providing the said signals in serial form to said sum and difference signal producing means.

Claim 10

A system as recited in claim 8 wherein each of said first and second storing means comprises a shift register.

Claim 11

A system as recited in claim 1 further including a receiving system for the transmitted, bandwidth-compressed video signals comprising: means for receiving and decoding said bandwidth-compressed, transmitted video signals and producing corresponding decoded digital signals, means for inversely orthonormally transforming said decoded digital signals to produce output digital signals corresponding to the composite video signal, and means for converting the output digital signals from said inverse orthonormal transforming means to corresponding analog composite video signals.

Claim 12

A receiving system as recited in claim 10 wherein said orthonormal transforming means comprises a Hadamard Transformer.

Claim 13

A receiving system as recited in claim 10 wherein said decoding means comprises a Delta PCM decoder.

Claim 14

A receiving system as recited in claim 10 wherein the decoded digital signals include high and low order sequence signals, further comprising: means for inverting the high order sequence signals of the decoded digital signals corresponding to alternate horizontal lines of the composite video signal, first means for storing the decoded digital signals corresponding to one horizontal line period of the composite video signal, means for supplying the decoded digital signals of low order sequence from said decoder to said storing means and for applying the decoded digital signals of high order sequence alternately from said decoder and from said inverter for said alternate horizontal lines, in series form, said storing means providing the digital signals stored therein in parallel form to said inverse orthonormal transforming means, said inverse orthonormal transforming means producing parallel, inversely transformed, output digital signals, and second storing means for receiving and storing said parallel, inversely transformed output digital signals from said orthonormal transforming means and providing the said output digital signals stored therein in serial form to said digital to analog converting means.

Claim 15

A receiving system as recited in claim 13 wherein each of said first and second storing means comprises a shift register.

Claim 20

A receiver for bandwidth-compressed, transmitted video signals wherein a composite NTSC video signal prior to transmission is converted to digital form and orthonormally transformed and the sum and difference signals of the transformed digital signals corresponding to successive horizontal line periods of the composite video signal with respect to the respectively next preceding horizontal line periods, are separately predictively coded for bandwidth compression and sequential transmission, whereby said sum and difference signals respectively correspond to luminance and chrominance signals, comprising: means for receiving and decoding the signals transmitted by the transmitter to provide decoded digital signals, means for inversely orthonormally transforming the decoded digital signals to produce digital output signals corresponding to the NTSC composite video signal, and digital to analog converting means for converting the digital output signals to an analog NTSC composite video signal corresponding to the NTSC composite video signal supplied at the transmitter for transmission.

Claim 21

A receiver for bandwidth-compressed, transmitted video signals wherein a composite NTSC video signal prior to transmission is converted to digital form and orthonormally transformed and the sum and difference signals of the transformed digital signals corresponding to successive horizontal line periods of the composite video signal with respect to the respectively next preceding horizontal line periods, are separately predictively coded for bandwidth compression and sequential transmission, whereby said sum and difference signals respectively correspond to luminance and chrominance signals, comprising: means for receiving and decoding the signals transmitted by the transmitter to provide decoded digital signals, means for inversely orthonormally transforming the decoded digital signals to produce digital output signals corresponding to the NTSC composite video signal, and digital to analog converting means for converting the digital output signals to an analog NTSC composite video signal corresponding to the NTSC composite video signal supplied at the transmitter for transmission.

Claim 24

A method as recited in claim 18, further comprising: converting the supplied composite NTSC video signal to a corresponding digital signal, and orthonormally transforming said corresponding digital signals, and producing the sum and difference signals from the orthonormally transformed signals.

Claim 25

A method for receiving signals transmitted in accordance with the method as recited in claim 18, further including: means for receiving and decoding said bandwidth-compressed, transmitted video signals and producing corresponding decoded output signals, inversely orthonormally transforming said decoded output signals to produce digital signals corresponding to the composite video signal, and converting the digital signals to corresponding analog composite video signals.